I sincerely apologize for the inconvenience and for the delay in assistance. I had a look into your account and see that an invitation was sent. Have you found how to update the permission reminder? If you were not able to find the answer you were looking for, or if others see this post and are looking for how do update the permission statement, I’d like to offer an article with the step-by-step instructions. You can find that here: Change an Event Related Email's Message header. Please let us know if we can assist you further!